GCM即Galois/Counter Mode，指的是加密采用Counter模式，并且带有GMAC消息认证码

import lombok.extern.slf4j.Slf4j;import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.GCMParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.security.SecureRandom;
import java.util.Arrays;
import java.util.Base64;/*** Description: GCM即Galois/Counter Mode，指的是加密采用Counter模式，并且带有GMAC消息认证码** @author whip* @version 1.0* @date 2023/11/28 10:06*/
@Slf4j
public class AesGcmUtil {/*** 加密** @param plaintext* @param secretString* @return* @throws Exception*/public String encrypt(String plaintext, String secretString) throws Exception {byte[] IV = new byte[12];SecureRandom random = new SecureRandom();random.nextBytes(IV);byte[] secretKey = Base64.getDecoder().decode(secretString);SecretKeySpec keySpec = new SecretKeySpec(secretKey, "AES");GCMParameterSpec gcmParameterSpec = new GCMParameterSpec(128, IV);Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding");cipher.init(Cipher.ENCRYPT_MODE, keySpec, gcmParameterSpec);byte[] cipherText = cipher.doFinal(plaintext.getBytes(StandardCharsets.UTF_8));ByteBuffer byteBuffer = ByteBuffer.allocate(IV.length + cipherText.length);byteBuffer.put(IV);byteBuffer.put(cipherText);return Base64.getEncoder().encodeToString(byteBuffer.array());}/*** 解密** @param ciphertext* @param secretString* @return* @throws Exception*/public String decrypt(String ciphertext, String secretString) throws Exception {byte[] encrypted = Base64.getDecoder().decode(ciphertext);byte[] IV = Arrays.copyOfRange(encrypted, 0, 12);Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding");GCMParameterSpec gcmParameterSpec = new GCMParameterSpec(128, IV);byte[] secretKey = Base64.getDecoder().decode(secretString);SecretKeySpec keySpec = new SecretKeySpec(secretKey, "AES");cipher.init(Cipher.DECRYPT_MODE, keySpec, gcmParameterSpec);byte[] plaintext = cipher.doFinal(Arrays.copyOfRange(encrypted, 12, encrypted.length));return new String(plaintext);}/*** 产生密钥工具方法** @throws Exception*/public String generateSecret() throws Exception {KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");keyGenerator.init(256);SecretKey key = keyGenerator.generateKey();byte[] bytes = key.getEncoded();log.info("生成密钥：{}", Base64.getEncoder().encodeToString(bytes));return Base64.getEncoder().encodeToString(bytes);}public static void main(String[] args) throws Exception {AesGcmUtil util = new AesGcmUtil();// 产生密钥String secret = util.generateSecret();// 加密String ciphertext = util.encrypt("XXX-测试", secret);log.info("加密结果：{}", ciphertext);// 解密String decrypt = util.decrypt(ciphertext, secret);log.info("解密结果: {}", decrypt);}}